﻿using System;
using System.Collections.Generic;
using System.Text;

namespace _018传值_输出_引用_数组_具名_可选参数_5___输出参数
{
    internal class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Plaease  input  first Number");
            string arg1 = Console.ReadLine();
            double x = 0;
            bool b1 = double.TryParse(arg1, out x);
            

            if (b1 == false)
            {
                Console.WriteLine("请输出正确的数字");
                return;
            }
            else
            {
                Console.WriteLine(b1);
                Console.WriteLine(x);
            }
        }

    }
}
